LONDON (AP) – NATO members need to increase their air and missile defenses by 400 percent to counter the threat from Russia, the head of the military alliance said Monday, warning that Moscow could be ready to attack it within five years.

Secretary-General Mark Rutte said during a visit to London that he expects the 32 NATO members to agree to a big hike in military spending at a summit in the Netherlands this month.

Speaking at the Chatham House think tank, Rutte said Russia is outpacing the far bigger NATO in producing ammunition, and the alliance must take a “quantum leap” in collective defense.

“Wishful thinking will not keep us safe,” Mr. Rutte said. “We cannot dream away the danger. Hope is not a strategy. So NATO has to become a stronger, fairer and more lethal alliance.”

Mr. Rutte has proposed a target of 3.5 percent of economic output on military spending and another 1.5 percent on “defense-related expenditure” such as roads, bridges, airfields and sea ports. He said he is confident the alliance will agree to the target at its summit in The Hague on June 24-25.

At the moment, 22 of the 32 members meet or exceed NATO’s current 2 percent target, which was set in 2014. Mr. Rutte said he expects all to reach 2 percent by the end of this year.

The new target would meet a demand by U.S. President Donald Trump that member states spend 5 percent of gross domestic product on defense. Mr. Trump has long questioned the value of NATO and complained that the U.S. provides security to European countries that don’t contribute enough.

Mr. Rutte said he agreed that “America has carried too much of the burden for too long.”

Mr. Rutte said NATO needs thousands more armored vehicles and millions more artillery shells, as well as a 400 percent increase in air and missile defense.

“We see in Ukraine how Russia delivers terror from above, so we will strengthen the shield that protects our skies,” he said.

“Russia could be ready to use military force against NATO within five years,” Mr. Rutte added. “We are all on the eastern flank now.”

Mr. Rutte also held talks Monday with Prime Minister Keir Starmer and praised the UK’s commitment to increase defense spending as “very good stuff.” Mr. Starmer has pledged to boost military spending to 2.5 percent of gross domestic product by 2027 and to 3 percent by 2034.

Like other NATO members, the UK has been reassessing its defense spending since Russia’s full-scale invasion of Ukraine in February 2022.

European NATO members, led by the UK and France, have scrambled to coordinate their defense posture as Mr. Trump transforms American foreign policy, seemingly sidelining Europe as he looks to end the war in Ukraine.

Last week the UK government said it would build new nuclear-powered attack submarines, prepare its army to fight a war in Europe and become “a battle-ready, armor-clad nation.” The plans represent the most sweeping changes to British defenses since the collapse of the Soviet Union more than three decades ago.